Omega Cal 26.7 T3 advice

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Hello everyone,

I've recently got my hand's on this funky Omega watch in 9ct screw-back case with three notches on it. It's housing Omega cal. 26.5 T3, based on information online the production of this movement is dating to 1945.
I would like to ask for a help to identify it (possible ref. number, possible case maker, provenance), I've only seen one like this in chrome/steel case also without a serial number or a reference number.
Thank you in advance.
 
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This type of 9ct marking is often seen on watches which were cased in Australia.

It is unlikely that there is a reference number associated with it, as would be with a Swiss made case.
 
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Nice one!!!